MOSFET in open collector configuration

[yoshiminea]

Hello everyone,

I'd like to send command pulse to L/H PULSE through MOSFET in open collector configuration.

I'm considering to connect Arduino PWM pin to the gate of MOSFET. Would that work?

Thank you for your help in advance.

[Wawa]

Diagram on the right looks like the opto coupler inputs of a stepper motor driver, correct?
Assuming you use a 5volt-logic Arduino... Why don't you power the optos from 5volt. Then you can drive them directly with an Arduino output. No transistors or resistors needed.
Leo..

[TomGeorge]

Hi, @yoshiminea
Welcome to the forum.

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What controller are you connecting to?
What model Arduino controller are you using?

Thanks.. Tom..

[jim-p]

@yoshiminea

I'm considering to connect Arduino PWM pin to the gate of MOSFET. Would that work?

Which Arduino and which MOSFET?

[yoshiminea]

Yes, the circuit is for controlling a servo driver, but I'm not sure whether the electronic components shown on the right-hand side of the diagram are optocouplers. I've looked up on the internet, but the symbol seems different.
The schematic diagram provided by the servo driver company suggests this circuit, so I presume these components require 12V command pulse instead of 5V.

[yoshiminea]

Hello Tom,

I'm happy to join the community.

I have read through the guidelines. I'll keep them in my mind when I make a post next time.

I'm connecting to Panasonic Servo Driver MINAS A4 200W MADDT1207003 from Arduino Mega.

[yoshiminea]

Hello,

Arduino Mega and MOSFET AOD4184A.

[yoshiminea]

This the full picture. I'm choosing the second option. I hope this helps.

[TomGeorge]

Hi, @yoshiminea

@yoshiminea

I'm connecting to Panasonic Servo Driver MINAS A4 200W MADDT1207003 from Arduino Mega.

If this is your driver;

Then this is what you need.
MINAS_A4_Series.pdf (1.8 MB)

Happy reading.

Tom...

[jim-p]

OK. Connect like this

[TomGeorge]

@yoshiminea

This the full picture. I'm choosing the second option. I hope this helps.

Yes, that will work.
If you are using the output direct from the Mega, then do the calculation for 5V.
The Mega pinout current is able to drive 10mA direct.

What a stupid formula configuration.

( 5 - 1.5 ) / ( R + 220 ) = 0.01
3.5 / ( R + 220 ) = 0.01
3.5 / 0.01 = R + 220

R = ( 3.5 /0.01 ) - 220
R = 350 - 220
R = 130 Ohms

Tom..

[Wawa]

@yoshiminea

I'm choosing the second option.

The first option uses 5volt-logic...
Leo..

[gilshultz]

@yoshiminea

MOSFET in open collector configuration.

I must have bad MOSFETs, they have a Gate, Source, and Drain but no collector.

[TomGeorge]

Hi, @yoshiminea
Can you please post a link to the data/specs that you got this from?

Thanks.. Tom...

[yoshiminea]

@jim-p

image697×626 7.05 KB

I have done the simulation but it is not working, unfortunately. Could you take a look?

MOSFET specifications:
Vds = 30V
Rds = 0.0072
Polarity = N-chan

[yoshiminea]

Thank you Tom.

I did read it and It's causing headache haha.

[yoshiminea]

Yes, I'm mistaken. In the schematic diagram, the manufacturer recommends using a BJT. However, I saw in another post that it mentions using a MOSFET instead when interfacing with an Arduino.

[yoshiminea]

ohh ok, I'll try tomorrow.

Thank you.

[yoshiminea]

It is in the datasheet you provided earlier.

@TomGeorge

MINAS_A4_Series.pdf

[jim-p]